Wal-Mart is mainly involved in retail. Wal-Mart Stores, Inc. (WMT stock exchange code: Wal-Mart Stores, Inc.) is an American global chain enterprise with the largest turnover in the world, and its controlling shareholder is the Walton family. Wal-Mart has four main forms: Wal-Mart Shopping Plaza, Sam Member Store, Wal-Mart Supermarket and Wal-Mart Community Store.